She was the daughter of a M. de Roussan, of Avignon, and after the death of her father had been educated in the house of her grandfather, M. de Nochères, who loved her as the apple of his eye. He was a very wealthy man, and she would be his heiress. At the age of thirteen she married the Marquess, who brought her to Paris. When aged twenty she was a widow, as her husband was drowned in the Mediterranean. She then returned to Avignon, and was at once surrounded by suitors. Her choice fell on the Marquess de Ganges, younger than herself, a man of a weak character, but with pleasant manners. The marriage took place in 1658. By him she became the mother of two children, a son and a daughter.

After a while the affection of the Marquess for his wife died away. Her superiority in mind and character offended his self-esteem, and to add to this his brother, the Abbé de Ganges, did his utmost to estrange the married couple.

The Marquess had three younger brothers. The elder, the Count de Ganges, does not enter into the story except towards its close. The second brother was the Abbé. This man was clever, cultured, of insinuating manners. He was not really in Holy Orders, but was one of those who at the period assumed a semi-ecclesiastical dress, and was given a benefice in commendam, the duties of which he never performed as unqualified, but the income of which he devoured. The third brother, the Chevalier, was a poor, weak creature, completely in the hands of the Abbé. The Marquess was much from home. He lived on bad terms with his wife; he found life dull in a little country town, and he liked the dissipation of a capital. He left his two younger brothers at the château, and placed the management of his estates in the hands of the Abbé.

According to Pitaval, both brothers fell in love with the far older Marquise, and the Abbé ventured to declare his sentiments towards her, and was repulsed with disdain so cutting as to fill him with resentment. Soon after M. de Nochères died, and left his vast fortune to his granddaughter in such a manner that her husband could not touch a penny of it without her consent. The Marquise at once had her will drawn up, bequeathing all her fortune to her mother, Mme. de Roussan, in trust for her children, but with the singular proviso that this old lady was to leave it entire to either one or other of her grandchildren, whichever she chose. When she deposited this will with the town councillor of Avignon, she added a codicil to the effect that in the event of her death and a later will being found this later will was to be regarded as invalid, as wrung from her against her intent, and that the above will was alone to take effect. This provision was witnessed by several persons of authority, and she insisted further that it should be kept secret and in no way divulged.

On her return to Ganges she was cheerful, saw a good deal of company, and seemed to be without suspicion of evil devised against her. What made her the more easy was that her stepmother was there, and in her presence the Abbé and the Chevalier were circumspect.

But before long the dowager marquise left for Montpellier, and her husband also departed. Since she had become an heiress he had feigned greater affection for her, and had treated her with courtesy. After his departure the Abbé had conferences with her. He assured her that the Marquess was deeply attached to her, but was wounded to the quick by her having made a will that passed him over; that the only possible way of concord being completely re-established was for her to alter the terms of her will.

The Marquise was a woman. She allowed herself to be persuaded, and under the dictation of the Abbé drew up a second will, whereby she constituted her husband sole heir. But she did not revoke the other, the former will deposited at Avignon, and the Abbé, knowing nothing of her final declaration made there to vitiate any second disposition of her property, was satisfied.

It is wholly unnecessary to accept the romance of the passion of the Abbé for his sister-in-law imported into the story by Pitaval, and for which no evidence was produced later. She was then aged twenty-nine, older than the two elder brothers. The fact of the will having been extorted from her, and the prospect of being able to share in the spoils should she die, is sufficient to account for what follows. The object of the Abbé now was to get rid of the Marquise.

She was not feeling well, and on the morning of May 17th, 1667, sent for the doctor, and asked for a draught. But when this was brought to her it looked dark and muddy, and she refused to drink it. It was not proved that this was poisoned, but it is not improbable that it was so. The Abbé and the Chevalier all day seemed restless, and were continually inquiring as to her condition, and seemed little pleased to learn that she was recovering from her indisposition.